蓖麻油基双重交联防腐蚀水性聚氨酯的制备及性能

Preparation and properties of castor oil-based double cross-linked anticorrosion waterborne polyurethane

以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯二醇-1000(PCDL-1000)、蓖麻油(CO)、季戊四醇三丙烯酸酯(PETA)为主要原料,使用丙酮法制备了一系列双重交联的CO基水性聚氨酯(CWPU)乳液。采用FTIR、紫外-可见分光光度计、铅笔硬度计、电子万能实验机、SEM、电化学工作站对CWPU薄膜进行了表征,测试了CWPU薄膜的拉伸性能、耐水性、耐磨性及耐腐蚀性,探讨了其耐腐蚀机理。结果表明,当CO含量(以乳液溶质总质量计,下同)为4%时,制备的薄膜CWPU的24 h吸水率仅为4.5%,对Q235钢板基底的附着力为0级,对Q235钢板基底的保护效率可达99.05%,表明所制CWPU薄膜具有优异的耐水、防腐蚀性能。

A series of double crosslinked castor oil(CO)based waterborne polyurethane(CWPU)emulsions were synthesized from isophorone disocyanate(IPDI),polycarbonate diol 1000(PCDL-1000),CO and pentaerythritol triacrylate(PETA)via acetone method.The CWPU films obtained were then characterized by FTIR,ultraviolet-visible spectrophotometer,pencil hardness tester,electronic universal test machine,SEM and electrochemical workstation,followed by investigation on the tensile properties,water resistance,wear resistance and corrosion resistance as well as the anti-corrosion mechanism.The results showed that CWPU film with 4%CO(based on the total mass of solutes in emulsion),exhibited water absorption of only 4.5%in 24 h,the adhesion to Q235 steel substrate of 0 grade,and a protection efficiency of 99.05%for Q235 steel substrate,indicating excellent water resistance and corrosion resistance.